Final answer:
The hydrogen ion concentration of a solution with pH = 2.25 is 10^-2.25 M.
Step-by-step explanation:
The hydrogen ion concentration of a solution with pH = 2.25 can be calculated using the formula: [H+]= 10-pH. So, for a solution with pH = 2.25, the hydrogen ion concentration would be 10-2.25 M.